(5) Light rays frave ling in the surface air are inci dent on of In air, the 1light rays a ma ke e 40 with the ang e of while an hor mal カ the Jur tace the in the substance rays make an angle ot the in dex 20° with the normal. Calculate of refraction of the substace.
(5) Light rays frave ling in the surface air are inci dent on of In air, the 1light rays a ma ke e 40 with the ang e of while an hor mal カ the Jur tace the in the substance rays make an angle ot the in dex 20° with the normal. Calculate of refraction of the substace.
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